What is the formula of the pole arc of the universal commutator motor?
(a) pole arc = ratio of armature axial length to armature diameter * pole pitch
(b) pole arc = ratio of armature axial length to armature diameter + pole pitch
(c) pole arc = ratio of armature axial length to armature diameter – pole pitch
(d) pole arc = ratio of armature axial length to armature diameter / pole pitch
This question was posed to me in examination.
I want to ask this question from Design of Small Universal Commutator Motors topic in chapter Design of Small Electrical Machines, Starters and Field Regulators of Design of Electrical Machines